Ninhydrin in Forensic Science

The video tutorial by MP Dillahunty at UCA demonstrates the use of ninhydrin in forensic science. Ninhydrin is a compound that reacts with amino acids in sweat, turning fingerprints purple. The tutorial covers the preparation of ninhydrin solutions, application on evidence, and methods to develop and accelerate the visibility of fingerprints. The process involves dissolving ninhydrin in solvents, applying it to paper, and using heat to speed up the reaction. This technique is crucial for law enforcement to identify suspects by comparing developed fingerprints with those in databases.

What is the primary use of ninhydrin in forensic science?

• To detect blood stains

• To develop fingerprints

• To analyze hair samples

• To identify DNA

Who discovered the reaction of ninhydrin with amino acids?

• MP Dillahunty

• Jane Smith

• John Doe

• Steve Breathe

What does ninhydrin react with to reveal fingerprints?

• Proteins

• Lipids

• Carbohydrates

• Amino acids

What is the first step in preparing ninhydrin for use?

• Heating in an oven

• Mixing with water

• Freezing

• Dissolving in solvents

Why do technicians wear cotton gloves when handling evidence?

• To avoid fingerprints

• To prevent contamination

• To keep hands warm

• To improve grip

What tool is used to handle the sample during the ninhydrin process?

• Spatula

• Pliers

• Tweezers

• Scissors

How long is the sample typically left to develop naturally?

• 48-72 hours

• 24-48 hours

• 12-24 hours

• 1-2 hours

What is one method to speed up the development of fingerprints?

• Exposing to sunlight

• Placing in an oven

• Using a hairdryer

• Freezing the sample

What color do fingerprints turn after reacting with ninhydrin?

• Blue

• Green

• Purple

• Red

What can the developed fingerprints be compared to?

• Suspect records

• DNA samples

• Blood types

• Hair samples